CN104848599A - Air conditioning system and control method thereof - Google Patents
Air conditioning system and control method thereof Download PDFInfo
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- CN104848599A CN104848599A CN201510275839.0A CN201510275839A CN104848599A CN 104848599 A CN104848599 A CN 104848599A CN 201510275839 A CN201510275839 A CN 201510275839A CN 104848599 A CN104848599 A CN 104848599A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000007788 liquid Substances 0.000 claims description 76
- 239000012530 fluid Substances 0.000 claims description 75
- 230000001105 regulatory effect Effects 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 abstract description 16
- 230000009183 running Effects 0.000 abstract description 14
- 238000005057 refrigeration Methods 0.000 abstract description 8
- 230000007774 longterm Effects 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 106
- 239000010687 lubricating oil Substances 0.000 description 25
- 239000003507 refrigerant Substances 0.000 description 23
- 235000003642 hunger Nutrition 0.000 description 12
- 230000037351 starvation Effects 0.000 description 12
- 230000006835 compression Effects 0.000 description 10
- 238000007906 compression Methods 0.000 description 10
- 238000000926 separation method Methods 0.000 description 8
- 239000010725 compressor oil Substances 0.000 description 6
- 239000002826 coolant Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000005461 lubrication Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 235000015927 pasta Nutrition 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 239000010726 refrigerant oil Substances 0.000 description 2
- 206010008469 Chest discomfort Diseases 0.000 description 1
- 230000001914 calming effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 125000004122 cyclic group Chemical class 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005247 gettering Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02742—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using two four-way valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention provides an air conditioning system and a control method thereof. This air conditioning system is including setting gradually off-premises station, throttling arrangement, indoor set, first compressor and the second compressor on same return circuit, and air conditioning system still includes: and the adjusting device is used for adjusting the connection relation between the first compressor and the second compressor, so that the first compressor and the second compressor are switched between series connection and parallel connection, or the second compressor is independently operated, and oil in the first compressor and the second compressor is adjusted. The system can realize series connection and parallel connection of the compressors and refrigeration and heating switching on one hand, and can also ensure that the running life or running efficiency of the compressors cannot be influenced due to oil shortage or oil enrichment on the other hand, thereby ensuring the long-term reliability of the compressors.
Description
Technical field
The present invention relates to air-conditioning system technical field, particularly a kind of air-conditioning system and control method thereof.
Background technology
Environment temperature is lower, larger to the demand of air-conditioning heating amount, but the heat pump of single stage compress can only accomplish the normal startup optimization of minus 20 degrees at present, and heating capacity deep fades, heating effect can not ensure, unit reliability also meets a severe test.
Compare single stage compress heat pump, with air injection enthalpy-increasing Two-stage Compression system, heating capacity is comparatively large at low temperatures, and efficiency is higher.And Two-stage Compression system can reduce the pressure ratio of single-stage compressor, reduce delivery temperature, gettering efficiency and compression efficiency can be improved simultaneously, thus promote heating capacity and heating efficiency.
Compressor is air-conditioner " heart ", when the compressor is operated, there is a large amount of frictions its inside, for ensureing compressor reliability service and improving the performance of compressor, lubrication is one of important link, therefore lubricating oil is absolutely necessary to compressor, and lubricating oil has the effects such as lubrication, cooling, sealing to compressor.And compressor is to the requirement of the lubricating oil amount of having, if cross at least can lack of lubrication for the lubricating oil in compressor, and then damages compressor, if the lubricating oil in compressor is too much, then can reduce refrigeration performance, even may occur that oil hits the phenomenon damaging compressor.When air-conditioning system is run, parts of lubricating oil can discharge compressor together along with cold-producing medium, enters into system pipe arrangement, condenser and evaporimeter, only has when the lubricating oil be discharged in system can turn back to compressor smoothly, maintain the dynamic equilibrium of oil, just can guarantee compressor not oil starvation.Therefore certain oil reserve is the fundamental prerequisite ensureing compressor reliability service, only has when oil reserve exceedes the minimum oil mass of its needs, guarantee compressor safe and reliable operation, while compressor in oil reserve can not be too much, otherwise can refrigeration performance be reduced.
For the Two-stage Compression system of two compressor series connection, lubricating oil regulates the oil level being difficult to guarantee two compressors to be all balanced, another compressor of compressor rich oil is easily caused to lack oil condition, but because the Suck and exhaust pressure of two compressors is all different, when lubricating oil all enters into a compressor, the equal oil between compressor cannot be realized, therefore once the compressor lubricant oil imbalance of in Two-stage Compression system, be difficult to meet demand for lubricating oil in the short time.
Summary of the invention
The invention provides a kind of air-conditioning system and control method thereof, be difficult to the problem balanced with the lubricating oil solving the compressor in air-conditioning system of the prior art.
According to an aspect of the present invention, provide a kind of air-conditioning system, this air-conditioning system comprises the off-premises station be successively set on the same circuit, throttling arrangement, indoor set, the first compressor and the second compressor, air-conditioning system also comprises: adjusting device, adjusting device is used for regulating the annexation between the first compressor and the second compressor, first compressor and the second compressor are switched between series and parallel connections, or make the second compressor isolated operation, and the fluid in the first compressor and the second compressor is regulated.
Further, adjusting device comprises: connection in series-parallel adjusting portion, and connection in series-parallel adjusting portion is used for the first compressor and the second compressor are switched between series and parallel connections; Fluid adjusting portion, fluid adjusting portion is used for regulating the fluid in the first compressor and the second compressor.
Further, air-conditioning system also comprises: gas-liquid separator, first compressor is all connected with gas-liquid separator with the second compressor, the air entry of the first compressor is connected with the gas outlet of gas-liquid separator, connection in series-parallel adjusting portion comprises: the first cross valve, first valve port of the first cross valve is connected with the gas outlet of the first compressor, second valve port of the first cross valve is connected with the air entry of the second compressor, 3rd valve port of the first cross valve is connected with the gas outlet of gas-liquid separator, 4th valve port of the first cross valve is connected with the pipeline between off-premises station with the second compressor, wherein, first valve port of the first cross valve and the second valve port conducting of the first cross valve, and during the 4th valve port conducting of the 3rd valve port of the first cross valve and the first cross valve, first compressor and the second compressor are in series connection, first valve port of the first cross valve and the 4th valve port conducting of the first cross valve, and during the 3rd valve port conducting of the second valve port of the first cross valve and the first cross valve, the first compressor and the second compressor are in parallel connection.
Further, air-conditioning system also comprises: gas-liquid separator, first compressor is all connected with gas-liquid separator with the second compressor, first compressor is provided with the first equal oilhole, first equal oilhole is connected with the oil return opening of gas-liquid separator by the first pipeline, second compressor is provided with the second equal oilhole, second equal oilhole is connected with the oil return opening of gas-liquid separator by second pipe, fluid adjusting portion comprises: the first control valve, and the first control valve is arranged on the first pipeline to control the break-make of the first pipeline; Second control valve, the second control valve is arranged on second pipe to control the break-make of second pipe.
Further, air-conditioning system also comprises oil eliminator, the first filter, the first capillary and oil return valve, wherein, oil eliminator is arranged on the pipeline between the second compressor and off-premises station, 4th valve port of the first cross valve is connected with the pipeline between oil eliminator with the second compressor, and the oil-out of oil eliminator is connected with the oil return opening of gas-liquid separator by the 3rd pipeline; First filter, the first capillary and oil return valve are all arranged on the 3rd pipeline, and arrange successively along oil eliminator to the direction of gas-liquid separator.
Further, the 4th of the first cross valve the pipeline between valve port and oil eliminator is provided with check valve.
Further, the pipeline between check valve and oil eliminator is provided with the 3rd control valve.
Further, the pipeline between the first compressor to the first control valve is disposed with the second filter and the second capillary; Pipeline between second compressor to the first control valve is disposed with the 3rd filter and three capillary.
Further, air-conditioning system also comprises the second cross valve, first valve port of the second cross valve is connected with the gas outlet of oil eliminator, second valve port of the second cross valve is connected with off-premises station, 3rd valve port of the second cross valve is connected with indoor set, and the 4th valve port of the second cross valve is connected with the entrance of gas-liquid separator.
Further, throttling arrangement comprises first throttle element on the pipeline that is connected in turn between off-premises station and indoor set and second section fluid element, pipeline between first throttle element and second section fluid element is provided with fluid reservoir, and fluid reservoir is connected with the air entry of the second compressor by the 4th pipeline; Adjusting device also comprises the 4th control valve, 4th control valve is arranged on the 4th pipeline, wherein, first valve port of the first cross valve and the 4th valve port conducting of the first cross valve, and during the 3rd valve port conducting of the second valve port of the first cross valve and the first cross valve, when 3rd control valve and the 4th control valve are in closedown, the second compressor isolated operation.
Further, the first equal oilhole to the distance of the exhaust valve plate of the first compressor be the first equal oilhole to the first minimum oil level place of compressor distance 1/2; Second equal oilhole to the distance of the exhaust valve plate of the second compressor be the second equal oilhole to the minimum oil level of the second compressor distance 1/2.
Further, the aperture of the first equal oilhole and the second equal oilhole is all in the scope of 4mm to 8mm.
According to a further aspect in the invention, improve a kind of control method of air-conditioning system, air conditioner system control method by above-mentioned air-conditioning system realize, comprising: detecting step: detect the first compressor and or the second compressor in fluid whether reach poised state; Judge perform step: if the first compressor and or the second compressor in fluid do not reach poised state, then regulate adjusting device, make the first compressor and the second compressor be in parallel connection until the first compressor and the second compressor inner fluid reach balance.
Further, perform in step in judgement, regulate the first cross valve, the first valve port of the first cross valve is communicated with the second valve port of the first cross valve, and the 3rd valve port of the first cross valve is when being communicated with the 4th valve port of the first cross valve, the first compressor and the second compressor are in series connection; Regulate the first cross valve, make the first valve port of the first cross valve and the 4th valve port conducting of the first cross valve, and during the 3rd valve port conducting of the second valve port of the first cross valve and the first cross valve, the first compressor and the second compressor are in parallel connection.
Further, perform in step in judgement, if the first compressor inner fluid liquid level is higher than the first equal oilhole, then open the first control valve until the fluid in the first compressor reaches poised state; If the second compressor inner fluid liquid level higher than the second equal oilhole, then opens the second control valve until the fluid in the second compressor reaches balance.
Apply technical scheme of the present invention, adjusting device is provided with in air-conditioning system, by the regulating action of adjusting device, the first compressor and the second compressor can be made to switch between series and parallel connections, or make the second compressor isolated operation, when needing to regulate the fluid of the first compressor and the second compressor, the first compressor and the second compressor is only needed to be switched to the mode be connected in parallel, then cold-producing medium and lubricating oil is provided by gas-liquid separator to the first compressor and the second compressor, by the regulating action of adjusting device, the fluid in the first compressor and the second compressor is regulated simultaneously, be convenient to the equal oily demand of satisfied first compressor and the second compressor.The air-conditioning system of the application can realize the series and parallel connections of two compressors on the one hand, and freeze and heat switching, on the other hand, can also guarantee that compressor can not affect service life or running efficiency because of oil starvation or rich oil, ensure that the long-term reliability of compressor.And this system also can realize wider refrigerating operaton and heating operation scope and operational efficiency, refrigerating capacity when simultaneously improving heating capacity under ultralow temperature and heating efficiency and superhigh temperature during refrigeration and operational efficiency.
Accompanying drawing explanation
The Figure of description forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 diagrammatically illustrates the annexation figure of air-conditioning system of the present invention;
Fig. 2 diagrammatically illustrates annexation figure when the first compressor of air-conditioning system of the present invention and the second compressor are in series operation;
Fig. 3 diagrammatically illustrates annexation figure when the first compressor of air-conditioning system of the present invention and the second compressor are in parallel running;
Fig. 4 diagrammatically illustrates annexation figure during the second compressor isolated operation of air-conditioning system of the present invention; And
Fig. 5 diagrammatically illustrates the front view of the first compressor of the present invention or the second compressor.
Description of reference numerals:
10, off-premises station; 20, throttling arrangement; 21, first throttle element; 22, second section fluid element; 30, indoor set; 40, the first compressor; 41, the first equal oilhole; 50, the second compressor; 51, the second equal oilhole; 200, gas-liquid separator; 61, connection in series-parallel adjusting portion; 611, the first cross valve; 6111, the first valve port; 6112, the second valve port; 6113, the 3rd valve port; 6114, the 4th valve port; 62, fluid adjusting portion; 621, the first control valve; 622, the second control valve; 70, the first pipeline; 80, second pipe; 90, oil eliminator; 100, the first filter; 110, the first capillary; 120, oil return valve; 130, the 3rd pipeline; 140, check valve; 150, the 3rd control valve; 160, the second cross valve; 161, the first valve port; 162, the second valve port; 163, the 3rd valve port; 164, the 4th valve port; 170, fluid reservoir; 180, the 4th pipeline; 190, the 4th control valve; 210, the second filter; 220, the second capillary; 230, the 3rd filter; 240, three capillary.
Detailed description of the invention
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
See shown in Fig. 1 to Fig. 5, according to embodiments of the invention, provide a kind of air-conditioning system.
The air-conditioning system of the present embodiment comprises the off-premises station 10 be successively set on the same circuit, throttling arrangement 20, indoor set 30, first compressor 40 and the second compressor 50.
Air-conditioning system also comprises gas-liquid separator 200 and adjusting device, and during connection, the first compressor 40 is all connected with gas-liquid separator 200 with the second compressor 50; Adjusting device is used for regulating the annexation between the first compressor 40 and the second compressor 50, first compressor 40 and the second compressor 50 are switched between series and parallel connections, or make the second compressor 50 isolated operation, and the fluid in the first compressor 40 and the second compressor 50 is regulated.
Structure according to the present embodiment can be known, adjusting device is provided with in the air-conditioning system of the application, by the regulating action of adjusting device, the first compressor 40 and the second compressor 50 can be made to switch between series and parallel connections, or make the second compressor 50 isolated operation, when needing to regulate the fluid of the first compressor 40 and the second compressor 50, the first compressor 40 and the second compressor 50 is only needed to be switched to the mode be connected in parallel, then cold-producing medium and lubricating oil is provided by gas-liquid separator 200 to the first compressor 40 and the second compressor 50, by the regulating action of adjusting device, the fluid in the first compressor 40 and the second compressor 50 is regulated simultaneously, be convenient to the equal oily demand of satisfied first compressor 40 and the second compressor 50, substantially increase the reliability of air-conditioning system, extend the service life of compressor, improve the performance of air-conditioning system to a certain extent.
Refer again to shown in Fig. 1, the adjusting device in the present embodiment comprises connection in series-parallel adjusting portion 61 and fluid adjusting portion 62.
Wherein, connection in series-parallel adjusting portion 61 switches between series and parallel connections for making the first compressor 40 and the second compressor 50; Fluid adjusting portion 62 is for regulating the fluid in the first compressor 40 and the second compressor 50.
Preferably, the air entry of first compressor 40 of the present embodiment is connected with the gas outlet of gas-liquid separator 200, connection in series-parallel adjusting portion 61 comprises the first cross valve 611, first valve port 6111 of this first cross valve 611 is connected with the gas outlet of the first compressor 40, second valve port 6112 of the first cross valve 611 is connected with the air entry of the second compressor 50,3rd valve port 6113 of the first cross valve 611 is connected with the gas outlet of gas-liquid separator 200, and the 4th valve port 6114 of the first cross valve 611 is connected with the pipeline between off-premises station 10 with the second compressor 50.In the process of work, adjusted, the first compressor 40 and the second compressor 50 just can be made to switch between series and parallel connections by the connected relation of each valve port to the first cross valve 611, structure is simple, is convenient to realize.
Specifically, when the first valve port 6111 of the first cross valve 611 and the second valve port 6112 conducting of the first cross valve 611, and during the 4th valve port 6114 conducting of the 3rd valve port 6113 of the first cross valve 611 and the first cross valve 611, the first compressor 40 and the second compressor 50 are in series connection; First valve port 6111 of the first cross valve 611 and the 4th valve port 6114 conducting of the first cross valve 611, and during the 3rd valve port 6113 conducting of the second valve port 6112 of the first cross valve 611 and the first cross valve 611, the first compressor 40 and the second compressor 50 are in parallel connection.
Preferably, first compressor 40 is provided with the first equal oilhole 41, first equal oilhole 41 is connected with the oil return opening of gas-liquid separator 200 by the first pipeline 70, second compressor 50 is provided with the equal oilhole 51 of the second equal oilhole 51, second to be connected by the oil return opening of second pipe with gas-liquid separator 200.Fluid adjusting portion 62 in the present embodiment comprises the first control valve 621 and the second control valve 622, first control valve 621 is arranged on the first pipeline 70 to control the break-make of the first pipeline 70; Second control valve 622 is arranged on second pipe 80 to control the break-make of second pipe 80.
In actual design, first equal oilhole 41 is arranged on the housing of high pressure chest (discharge chamber) side of the first compressor 40, similarly, second equal oilhole 51 is also arranged on the on high-tension side housing of the second compressor 50, the top of minimum oil level required when the first equal oilhole 41 and the second equal oilhole 51 are all positioned at corresponding compressor operating, and below corresponding Compressor Air Exhaust Valve Plate, as shown in Figure 5.
In the production of compressor, there is individual minimum requirements amount in compressor producer to compressor oil level, the minimum oil level that this compressor allows is positioned at below exhaust valve plate certainly, getting exhaust valve plate to the height at this minimum oil level place is h, consider that compressor its pasta in running is spill simultaneously, namely the center of pasta will slightly lower than the oil level along compressor inwall place, and the distance of the exhaust valve plate of equal oilhole 41 to the first compressor 40 of first in the present embodiment is 1/2 of the distance at the first equal minimum oil level place of oilhole 41 to the first compressor 40; The distance of the exhaust valve plate of the second equal oilhole 51 to the second compressor 50 is 1/2 of the distance of the minimum oil level of the second equal oilhole 51 to the second compressor 50, and the minimum oil level 2h/3 place required higher than producer is located in the position of the equal oilhole namely in the present embodiment.
Preferably, the aperture of first in the present embodiment all oilhole 41 and the second equal oilhole 51 all in the scope of 4mm to 8mm, such as 6mm.
By the effect of the first control valve 621, fluid in first compressor 40 can be regulated, specifically, if the first compressor 40 inner fluid liquid level is higher than the first equal oilhole 41, then open the first control valve 621 until the fluid liquid level in the first compressor 40 arrives the first equal oilhole 41.
Similarly, by the effect of the second control valve 622, fluid in second compressor 50 can be regulated, specifically, if the second compressor 50 inner fluid liquid level is higher than the second equal oilhole 51, then open the second control valve 622 until the fluid liquid level in the second compressor 50 arrives the second equal oilhole 51.
It should be noted that, first in the present embodiment all oilhole 41 and the second equal oilhole 51 be all arranged on corresponding compressor be in optimum Working time fluid position.
Again shown in composition graphs 1, air-conditioning system also comprises oil eliminator 90, first filter 100, first capillary 110 and oil return valve 120, wherein, oil eliminator 90 is arranged on the pipeline between the second compressor 50 and off-premises station 10,4th valve port 6114 of the first cross valve 611 is connected with the pipeline between oil eliminator 90 with the second compressor 50, and the oil-out of oil eliminator 90 is connected with the oil return opening of gas-liquid separator 200 by the 3rd pipeline 130; First filter 100, first capillary 110 and oil return valve 120 are all arranged on the 3rd pipeline 130, and the direction along oil eliminator 90 to gas-liquid separator 200 is arranged successively.
Preferably, the pipeline between the 4th valve port 6114 of the first cross valve 611 and oil eliminator 90 is provided with check valve 140, prevents the fluid in oil eliminator 90 from refluxing.
Preferably, the pipeline between check valve 140 and oil eliminator 90 is provided with the 3rd control valve 150, effectively prevents the fluid in oil eliminator 90 from refluxing further, be convenient to control the break-make of the pipeline between check valve 140 and oil eliminator 90.
Preferably, the pipeline between the first compressor 40 to the first control valve 621 is disposed with the second filter 210 and the second capillary 220; Pipeline between second compressor 50 to the first control valve 621 is disposed with the 3rd filter 230 and three capillary 240.
In an embodiment, air-conditioning system also comprises the second cross valve 160, first valve port 161 of this second cross valve 160 is connected with the gas outlet of oil eliminator 90, second valve port 162 of the second cross valve 160 is connected with off-premises station 10,3rd valve port 163 of the second cross valve 160 is connected with indoor set 30, and the 4th valve port 164 of the second cross valve 160 is connected with the entrance of gas-liquid separator 200.
Preferably, throttling arrangement 20 comprises first throttle element 21 on the pipeline that is connected in turn between off-premises station 10 and indoor set 30 and second section fluid element 22, pipeline between first throttle element 21 and second section fluid element 22 is provided with fluid reservoir 170, this fluid reservoir 170 is connected with the air entry of the second compressor 50 by the 4th pipeline 180.
Adjusting device in the present embodiment also comprises the 4th control valve 190,4th control valve 190 is arranged on the 4th pipeline 180, wherein, when the first valve port 6111 of the first cross valve 611 and the 4th valve port 6114 conducting of the first cross valve 611, and during the 3rd valve port 6113 conducting of the second valve port 6112 of the first cross valve 611 and the first cross valve 611, when 3rd control valve 150 and the 4th control valve 190 are in closedown, the second compressor 50 isolated operation.
The course of work specifically introducing the air-conditioning system of the present embodiment below according to above-mentioned structure is as follows:
(1) first compressor 40 and the second compressor 50 series operation
Annexation when the first compressor 40 and the second compressor 50 series operation is as shown in Figure 2: the first valve port 6111 and the second valve port 6112 conducting of the first cross valve 611,3rd valve port 6113 of the first cross valve 611 and the 4th valve port 6114 conducting, as shown in the direction of arrow, now, 3rd control valve 150 is closed, and control valve the 4th control valve 190 can be opened and can close; Because the solid lines of oil eliminator 90 represent open circuit, namely circulate without refrigerant.Dotted line represents gaseous coolant stream, and fine line represents liquid or gas-liquid two-phase state refrigerant and oil return stream.
During work, refrigerant enters after the first compressor 40 through gas-liquid separator 200 and completes one stage of compression, then the second compressor 50 is entered, now the closing control of the 4th control valve 190 is according to environment temperature and compressor frequency, when the 4th control valve 190 is opened, gaseous coolant with fluid reservoir 170 is mixed into the second compressor 50 by the exhaust of the first compressor 40, realizes air injection enthalpy-increasing two-stage compression; High pressure refrigerant after the second compressor 502 compresses enters oil eliminator 90 and carries out being separated of refrigerant and lubricating oil, when oil return valve 120 is opened, lubricating oil then can enter gas-liquid separator 200 by the first filter 100, first capillary 110 and oil return valve 120, thus enter the first compressor 40 and the second compressor 50, guarantee that the first compressor 40 and the second compressor 50 can not cause wearing and tearing etc. because of oil starvation.Then indoor set 30 or off-premises station 10 is entered through the second cross valve 160 with the high pressure gaseous refrigerant after lubricating oil separation.
A () is when the first compressor 40 and the second compressor 50 cascade refrigeration are run, first high pressure gaseous refrigerant enters off-premises station 10 and is condensed into high-pressure liquid, the refrigerant of liquid mixed state of calming the anger in being formed after then carrying out one-level throttling by first throttle element 21, then refrigerant enters fluid reservoir 170, and in fluid reservoir 170, carry out the separation of gas-liquid two-phase, the exhaust of the gaseous coolant after separation and the first compressor 40 enters the air entry of the second compressor 50, liquid refrigerants after separation becomes low-pressure low-temperature refrigerant after second section fluid element 22 carries out two-step throttle, then enter indoor set 30 and carry out heat absorption evaporation, evaporated laggard enter gas-liquid separator 200 then enter the air entry of the first compressor 40, thus complete whole air injection enthalpy-increasing two-stage compression kind of refrigeration cycle.
B () is when heating operation connected by the first compressor 40 and the second compressor 50, first high pressure gaseous refrigerant enters indoor set 30 and is condensed into high-pressure liquid, then formed in gas-liquid mixed state after carrying out one-level throttling by second section fluid element 22 and press refrigerant, then refrigerant enters fluid reservoir 170, and in fluid reservoir 170, carry out the separation of gas-liquid two-phase, the exhaust of the gaseous coolant after separation and the first compressor 40 enters the air entry of the second compressor 50, liquid refrigerants after separation becomes low-pressure low-temperature refrigerant after first throttle element 21 carries out two-step throttle, then enter off-premises station 10 and carry out heat absorption evaporation, evaporated laggard enter gas-liquid separator 200 then enter the air entry of the first compressor 40, thus complete whole air injection enthalpy-increasing two-stage compression kind of refrigeration cycle.During series operation, when the 4th control valve 190 is closed, then the exhaust of the first compressor 40 directly enters the air-breathing of the second compressor 50, and centre can not mix with the refrigerant in fluid reservoir 170, thus can not realize increasing enthalpy effect.
(2) first compressor 40 and the second compressor 50 parallel runnings
When the first compressor 40 and the second compressor parallel, system as shown in Figure 3: the first valve port 6111 of the first cross valve 611 and the 4th valve port 6114 conducting, second valve port 6112 of the first cross valve 611 and the 3rd valve port 6113 conducting, as direction of arrow conducting, 3rd control valve 150 is opened, and control valve the 4th control valve 190 is closed.Heavy line lines represent open circuit, namely circulate without refrigerant.Now can open the first control valve 621 and the second control valve 622, carry out the equal oil of two compressors.Dotted line represents gaseous coolant stream, and solid line represents liquid or gas-liquid two-phase state refrigerant and oil return stream.
During work, refrigerant enters the air entry of the first compressor 40 and the second compressor 50 simultaneously after flowing through gas-liquid separator 200, through overcompression laggard enter oil eliminator 90 carry out being separated of refrigerant and lubricating oil, when oil return valve 120 is opened, lubricating oil then can enter gas-liquid separator 200 by the first filter 100, first capillary 110 and oil return valve 120, thus enter the first compressor 40 and the second compressor 50, guarantee that the first compressor 40 and the second compressor 50 can not cause wearing and tearing etc. because of oil starvation.Then indoor set 30 is entered or off-premises station 10 carries out heating or refrigerating operaton through the second cross valve 160 with the high pressure gaseous refrigerant after lubricating oil separation.Detailed process and the first compressor 40 and the second compressor 50 series operation, repeat no more herein.
(3) second compressor 50 isolated operations
When extraneous ability need is low, system load hour, during the second compressor 50 isolated operation, system as shown in Figure 4: the first valve port 6111 of the first cross valve 611 and the 4th valve port 6114 conducting, second valve port 6112 of the first cross valve 611 and the 3rd valve port 6113 conducting, as direction of arrow conducting, the 3rd control valve 150 and control valve the 4th control valve 190 are all closed.Dotted line represents gaseous coolant stream, and fine line represents liquid or gas-liquid two-phase state refrigerant and oil return stream, and heavy line represents open circuit, namely circulates without refrigerant.Now the first compressor 40 stops, refrigerant enters the air entry of the second compressor 50 after flowing through gas-liquid separator 200, pass into oil eliminator 90 and the second cross valve 160 after having compressed, then enter indoor set 30 or off-premises station 10 carries out heating or refrigerating operaton.Detailed process and the first compressor 40 and the second compressor 50 series operation, repeat no more herein.
Be described above the first two feature of this system: Two-stage Compression and single stage compress switch and freeze and heat switching.
When appearance compressor rich oil, when another compressor lacks oil condition, need to regulate the first compressor 40 and the second compressor 50 inner fluid, this application provides a kind of air conditioner system control method, this air conditioner system control method by above-mentioned air-conditioning system realize, comprise step: detecting step: detect the first compressor 40 and or the second compressor 50 in fluid whether reach poised state; Judge perform step: if the first compressor 40 and or the second compressor 50 in fluid do not reach poised state, then regulate adjusting device, make the first compressor 40 and the second compressor 50 be in parallel connection until the first compressor 40 and the second compressor 50 inner fluid reach balance.
Particularly, perform in step in judgement, under the first compressor 40 and the second compressor 50 are switched to the pattern of parallel running, open between the first control valve 621 and the second control valve 622, two compressors all oily.It should be noted that, when the first compressor 40 and the second compressor 50 series operation, because the Suck and exhaust pressure of two compressors is different, the equal oil between two compressors cannot be realized, equal oil between two compressors controls, and needs to carry out under parallel running mode.
Shown in Figure 3, draw from the first equal oilhole 41 of the first compressor 40 gas-liquid separator 200 to be received by copper pipe inlet pipe through the second filter 210, second capillary 220, first control valve 621.Second filter 210 is for preventing the second capillary 220 blocked, and the second capillary 220 is for carrying out reducing pressure by regulating flow to tube fluid; Gas-liquid separator 200 to be received by copper pipe inlet pipe through the 3rd filter 230, three capillary 240, second control valve 622 is drawn from the second equal oilhole 51 of the second compressor 50.Second filter 210 and the 3rd filter 230 be respectively used to prevent the second capillary 220 and three capillary 240 blocked, the second capillary 220 and three capillary 240 are for carrying out reducing pressure by regulating flow to tube fluid.
Due in running the first compressor 40 be high pressure with the second compressor 50 discharge chamber, it is then low-pressure state in gas-liquid separator 200, therefore when the first control valve 621 and the second control valve 622 are opened, the lubricating oil of the first compressor 40 discharge chamber can flow to gas-liquid separator 200 by the second filter 210, second capillary 220 and the first control valve 621 smoothly, and the lubricating oil of the second compressor 50 discharge chamber can flow to gas-liquid separator 200 by the 3rd filter 230, three capillary 240 and the second control valve 622 smoothly.
Perform in step in judgement, regulate the first cross valve 611, first valve port 6111 of the first cross valve 611 is communicated with the second valve port 6112 of the first cross valve 611, and the 3rd valve port 6113 of the first cross valve 611 is when being communicated with the 4th valve port 6114 of the first cross valve 611, the first compressor 40 and the second compressor 50 are in series connection; First valve port 6111 of the first cross valve 611 is communicated with the 4th valve port 6114 of the first cross valve 611, and the second valve port 6112 of the first cross valve 611 is when being communicated with the 3rd valve port 6113 of the first cross valve 611, the first compressor 40 and the second compressor 50 are in parallel connection.
Preferably, perform in step in judgement, if the first compressor 40 inner fluid liquid level is higher than the first equal oilhole 41, then open the first control valve 621 until the fluid liquid level in the first compressor 40 arrives the first equal oilhole 41; If the second compressor 50 inner fluid liquid level is higher than the second equal oilhole 51, then open the second control valve 622 until the fluid liquid level in the second compressor 50 arrives the second equal oilhole 51.
Adopt the multi-connected machine of Multi-compressor parallel due to capacity comparatively large, the place of application generally needs tube connector longer, and indoor set 30 and off-premises station 10 exist certain high drop, and this situation more may make compressor there is the possibility of oil starvation.Therefore first the first compressor 40 and the interior lubricating oil added of the second compressor 50 enough will ensure that multiple compressors can be in flat oil condition (, near equal oilhole, height is within 10mm for oil level) when running any frequency.
Rich oil: the oil level in the first compressor 40 higher than the oil level in the first equal oilhole 41 or the second compressor 50 higher than the second equal oilhole 51
Oil starvation: the oil level in the first compressor 40 lower than the oil level in the first equal oilhole 41 or the second compressor 50 lower than the second equal oilhole 51;
Flat oil: the oil level of the oil level in the first compressor 40 near the first equal oilhole 41 or in the second compressor 50 is at the second equal oilhole 51, and height is within 10mm;
Oil level balances: after multiple compressors runs a period of time simultaneously, the oil level of the first compressor 40 and the second compressor 50 can keep stable state always, the level height of the first compressor 40 and the second compressor 50, all near equal oilhole, is all in the state of flat oil;
During work, the first compressor 40 and the second compressor 50 all need to run, then open the 3rd control valve 150 and the 4th control valve 190 of two compressors and correspondence thereof.Due to the difference of the initial oil level of two compressors, running frequency and oil drain quantity, a compressor oil starvation may be there is, the phenomenon of another compressor rich oil.If the first compressor 40 rich oil, it runs oil level higher than the first equal oilhole 41 position, because the pressure of compressor discharge chamber in running is higher than the pressure in gas-liquid separator, therefore lubricating oil can be passed through the first equal oilhole 41 discharged in gas-liquid separator 200 by the first compressor 40 of rich oil, makes the oil level of the first compressor 40 of rich oil reduce; And the second compressor 50 oil starvation, due to the second compressor 50 oil starvation, its oil level is lower than the second equal oilhole 51 position, and lubricating oil can not be passed through the second equal oilhole 51 discharged to gas-liquid separator 200 by the second compressor 50; Two compressors all obtain lubricating oil by air-breathing, so the second compressor 50 oil level of oil starvation can rise in running from gas-liquid separator 200 simultaneously.Therefore, in this cyclic process, the compressor oil level of rich oil can decline, and the compressor oil level of oil starvation can rise, until the oil level of two compressors reaches balance, two compressors are all in flat oil condition.
Can know according to the above embodiments, air-conditioning system of the present invention can realize the series and parallel connections of two compressors on the one hand, and freeze and heat switching, on the other hand, devise a kind of compressor oil equalization method, guarantee that compressor can not affect service life or running efficiency because of oil starvation or rich oil, ensure that the long-term reliability of compressor.And this system also can realize wider refrigerating operaton and heating operation scope and operational efficiency, refrigerating capacity when simultaneously improving heating capacity under ultralow temperature and heating efficiency and superhigh temperature during refrigeration and operational efficiency.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (15)
1. an air-conditioning system, it is characterized in that, comprise the off-premises station (10) be successively set on the same circuit, throttling arrangement (20), indoor set (30), the first compressor (40) and the second compressor (50), described air-conditioning system also comprises:
Adjusting device, described adjusting device is used for regulating the annexation between described first compressor (40) and described second compressor (50), described first compressor (40) and described second compressor (50) are switched between series and parallel connections, or make the isolated operation of described second compressor (50), and the fluid in described first compressor (40) and described second compressor (50) is regulated.
2. air-conditioning system according to claim 1, is characterized in that, described adjusting device comprises:
Connection in series-parallel adjusting portion (61), described connection in series-parallel adjusting portion (61) switches between series and parallel connections for making described first compressor (40) and described second compressor (50);
Fluid adjusting portion (62), described fluid adjusting portion (62) is for regulating the fluid in described first compressor (40) and described second compressor (50).
3. air-conditioning system according to claim 2, it is characterized in that, described air-conditioning system also comprises: gas-liquid separator (200), described first compressor (40) is all connected with described gas-liquid separator (200) with described second compressor (50), the air entry of described first compressor (40) is connected with the gas outlet of described gas-liquid separator (200), and described connection in series-parallel adjusting portion (61) comprising:
First cross valve (611), first valve port (6111) of described first cross valve (611) is connected with the gas outlet of described first compressor (40), second valve port (6112) of described first cross valve (611) is connected with the air entry of described second compressor (50), 3rd valve port (6113) of described first cross valve (611) is connected with the gas outlet of described gas-liquid separator (200), 4th valve port (6114) of described first cross valve (611) is connected with the pipeline between described off-premises station (10) with described second compressor (50), wherein,
First valve port (6111) of described first cross valve (611) and the second valve port (6112) conducting of described first cross valve (611), and during the 4th valve port (6114) conducting of the 3rd valve port (6113) of described first cross valve (611) and described first cross valve (611), described first compressor (40) and described second compressor (50) are in series connection;
First valve port (6111) of described first cross valve (611) and the 4th valve port (6114) conducting of described first cross valve (611), and during the 3rd valve port (6113) conducting of second valve port (6112) of described first cross valve (611) and described first cross valve (611), described first compressor (40) and described second compressor (50) are in parallel connection.
4. air-conditioning system according to claim 2, it is characterized in that, described air-conditioning system also comprises: gas-liquid separator (200), described first compressor (40) is all connected with described gas-liquid separator (200) with described second compressor (50), described first compressor (40) is provided with the first equal oilhole (41), described first equal oilhole (41) is connected by the oil return opening of the first pipeline (70) with described gas-liquid separator (200), described second compressor (50) is provided with the second equal oilhole (51), described second equal oilhole (51) is connected by the oil return opening of second pipe (80) with described gas-liquid separator (200), described fluid adjusting portion (62) comprising:
First control valve (621), described first control valve (621) is arranged on described first pipeline (70) to control the break-make of described first pipeline (70);
Second control valve (622), described second control valve (622) is arranged on described second pipe (80) to control the break-make of described second pipe (80).
5. air-conditioning system according to claim 3, it is characterized in that, described air-conditioning system also comprises oil eliminator (90), the first filter (100), the first capillary (110) and oil return valve (120), wherein
Described oil eliminator (90) is arranged on the pipeline between described second compressor (50) and described off-premises station (10), 4th valve port (6114) of described first cross valve (611) is connected with the pipeline between described oil eliminator (90) with described second compressor (50), and the oil-out of described oil eliminator (90) is connected with the oil return opening of described gas-liquid separator (200) by the 3rd pipeline (130);
Described first filter (100), described first capillary (110) and described oil return valve (120) are all arranged on described 3rd pipeline (130), and the direction along described oil eliminator (90) to described gas-liquid separator (200) is arranged successively.
6. air-conditioning system according to claim 5, it is characterized in that, the pipeline between the 4th valve port (6114) of described first cross valve (611) and described oil eliminator (90) is provided with check valve (140).
7. air-conditioning system according to claim 6, is characterized in that, the pipeline between described check valve (140) and described oil eliminator (90) is provided with the 3rd control valve (150).
8. air-conditioning system according to claim 4, it is characterized in that, the pipeline between described first compressor (40) to described first control valve (621) is disposed with the second filter (210) and the second capillary (220); Pipeline between described second compressor (50) to described second control valve (622) is disposed with the 3rd filter (230) and three capillary (240).
9. air-conditioning system according to claim 5, it is characterized in that, described air-conditioning system also comprises the second cross valve (160), first valve port (161) of described second cross valve (160) is connected with the gas outlet of described oil eliminator (90), second valve port (162) of described second cross valve (160) is connected with described off-premises station (10), 3rd valve port (163) of described second cross valve (160) is connected with described indoor set (30), 4th valve port (164) of described second cross valve (160) is connected with the entrance of described gas-liquid separator (200).
10. air-conditioning system according to claim 7, it is characterized in that, described throttling arrangement (20) comprises first throttle element (21) on the pipeline that is connected in turn between described off-premises station (10) and described indoor set (30) and second section fluid element (22), pipeline between described first throttle element (21) and described second section fluid element (22) is provided with fluid reservoir (170), and described fluid reservoir (170) is connected by the air entry of the 4th pipeline (180) with described second compressor (50);
Described adjusting device also comprises the 4th control valve (190), and described 4th control valve (190) is arranged on described 4th pipeline (180), wherein,
First valve port (6111) of described first cross valve (611) and the 4th valve port (6114) conducting of described first cross valve (611), and during the 3rd valve port (6113) conducting of second valve port (6112) of described first cross valve (611) and described first cross valve (611), when described 3rd control valve (150) and described 4th control valve (190) are in closedown, the isolated operation of described second compressor (50).
11. air-conditioning systems according to claim 4, it is characterized in that, the described first equal oilhole (41) to the distance of the exhaust valve plate of described first compressor (40) be the described first equal oilhole (41) to the described minimum oil level place of first compressor (50) distance 1/2;
Described second equal oilhole (51) to the distance of the exhaust valve plate of described second compressor (50) be the described second equal oilhole (51) to the minimum oil level of described second compressor (50) distance 1/2.
12. air-conditioning systems according to claim 11, is characterized in that, the aperture of the described first equal oilhole (41) and the described second equal oilhole (51) is all in the scope of 4mm to 8mm.
The control method of 13. 1 kinds of air-conditioning systems, is characterized in that, the air-conditioning system of described air conditioner system control method according to any one of claim 1 to 12 realizes, and comprising:
Detecting step: detect described first compressor (40) and or described second compressor (50) in fluid whether reach poised state;
Judge perform step: if described first compressor (40) and or described second compressor (50) in fluid do not reach poised state, then regulate described adjusting device, make described first compressor (40) and described second compressor (50) be in parallel connection until described first compressor (40) and described second compressor (50) inner fluid reach balance.
The control method of 14. air-conditioning systems according to claim 13, it is characterized in that, perform in step in described judgement, regulate the first cross valve (611), first valve port (6111) of described first cross valve (611) is communicated with second valve port (6112) of described first cross valve (611), and the 3rd valve port (6113) of described first cross valve (611) is when being communicated with the 4th valve port (6114) of described first cross valve (611), described first compressor (40) and described second compressor (50) are in series connection,
Regulate the first cross valve (611), make first valve port (6111) of described first cross valve (611) and the 4th valve port (6114) conducting of described first cross valve (611), and during the 3rd valve port (6113) conducting of second valve port (6112) of described first cross valve (611) and described first cross valve (611), described first compressor (40) and described second compressor (50) are in parallel connection.
The control method of 15. air-conditioning systems according to claim 14, is characterized in that, performs in step in described judgement,
If described first compressor (40) inner fluid liquid level higher than the first equal oilhole (41), then opens the first control valve (621) until the fluid in described first compressor (40) reaches poised state;
If described second compressor (50) inner fluid liquid level higher than the second equal oilhole (51), then opens the second control valve (622) until the fluid in described second compressor (50) reaches balance.
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| WO2018137125A1 (en) * | 2017-01-24 | 2018-08-02 | 徐生恒 | High-efficiency energy-saving air-energy dual-machine heat pump air conditioning system |
| CN110234938A (en) * | 2017-02-01 | 2019-09-13 | Lg电子株式会社 | The outdoor system of air conditioner |
| CN111256379A (en) * | 2018-11-30 | 2020-06-09 | 广东美芝精密制造有限公司 | Refrigerating device |
| US20210063066A1 (en) * | 2018-01-05 | 2021-03-04 | Gree Electric Appliances, Inc. Of Zhuhai | Circulation system of air conditioner, air conditioner, and air conditioner control method |
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| CN116324164A (en) * | 2020-09-30 | 2023-06-23 | 大金工业株式会社 | Compression device |
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| CN116324164A (en) * | 2020-09-30 | 2023-06-23 | 大金工业株式会社 | Compression device |
| CN114234487A (en) * | 2021-12-23 | 2022-03-25 | 中电建路桥集团有限公司 | Carbon dioxide variable circulating water source heat pump and hot water unit |
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